|
|
|
|
.\"
|
|
|
|
|
.\" Copyright 1998 by the Massachusetts Institute of Technology.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Permission to use, copy, modify, and distribute this
|
|
|
|
|
.\" software and its documentation for any purpose and without
|
|
|
|
|
.\" fee is hereby granted, provided that the above copyright
|
|
|
|
|
.\" notice appear in all copies and that both that copyright
|
|
|
|
|
.\" notice and this permission notice appear in supporting
|
|
|
|
|
.\" documentation, and that the name of M.I.T. not be used in
|
|
|
|
|
.\" advertising or publicity pertaining to distribution of the
|
|
|
|
|
.\" software without specific, written prior permission.
|
|
|
|
|
.\" M.I.T. makes no representations about the suitability of
|
|
|
|
|
.\" this software for any purpose. It is provided "as is"
|
|
|
|
|
.\" without express or implied warranty.
|
|
|
|
|
.\"
|
|
|
|
|
.TH ARES_GETHOSTBYNAME 3 "25 July 1998"
|
|
|
|
|
.SH NAME
|
|
|
|
|
ares_gethostbyname_file \- Lookup a name in the system's hosts file
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.nf
|
|
|
|
|
#include <ares.h>
|
|
|
|
|
|
|
|
|
|
int ares_gethostbyname_file(ares_channel \fIchannel\fP, const char *\fIname\fP,
|
|
|
|
|
int \fIfamily\fP, struct hostent **host)
|
|
|
|
|
.fi
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.B ares_gethostbyname_file
|
|
|
|
|
function performs a host lookup by name against the system's hosts file (or equivalent local hostname database).
|
|
|
|
|
The
|
|
|
|
|
.IR channel
|
|
|
|
|
parameter is required, but no asynchronous queries are performed. Instead, the
|
|
|
|
|
lookup is done via the same mechanism used to perform 'f' lookups
|
|
|
|
|
(see the
|
|
|
|
|
.I lookups
|
|
|
|
|
options field in \fIares_init_options(3)\fP).
|
|
|
|
|
The parameter
|
|
|
|
|
.I name
|
|
|
|
|
gives the hostname as a NUL-terminated C string, and
|
|
|
|
|
.I family
|
|
|
|
|
gives the desired type of address for the resulting host entry.
|
|
|
|
|
.PP
|
|
|
|
|
The return value indicates whether the query succeeded and, if not, how it
|
|
|
|
|
failed. It may have any of the following values:
|
|
|
|
|
.TP 19
|
|
|
|
|
.B ARES_SUCCESS
|
|
|
|
|
The host lookup completed successfully and
|
|
|
|
|
.I host
|
|
|
|
|
now points to the result (and must be freed with \fIares_free_hostent(3)\fP).
|
|
|
|
|
.TP 19
|
|
|
|
|
.B ARES_ENOTFOUND
|
|
|
|
|
The hostname
|
|
|
|
|
.I name
|
|
|
|
|
was not found.
|
|
|
|
|
.TP 19
|
|
|
|
|
.B ARES_EFILE
|
|
|
|
|
There was a file I/O error while performing the lookup.
|
|
|
|
|
.TP 19
|
|
|
|
|
.B ARES_ENOMEM
|
|
|
|
|
Memory was exhausted.
|
|
|
|
|
.PP
|
|
|
|
|
On successful completion of the query, the pointer pointed to by
|
|
|
|
|
.I host
|
|
|
|
|
points to a
|
|
|
|
|
.B struct hostent
|
|
|
|
|
containing the address of the host returned by the lookup. The user must
|
|
|
|
|
free the memory pointed to by
|
|
|
|
|
.IR host
|
|
|
|
|
when finished with it by calling \fIares_free_hostent(3)\fP. If the lookup did
|
|
|
|
|
not complete successfully,
|
|
|
|
|
.I host
|
|
|
|
|
will be
|
|
|
|
|
.BR NULL .
|
|
|
|
|
.SH AVAILABILITY
|
|
|
|
|
Added in c-ares 1.5.4
|
|
|
|
|
.SH SEE ALSO
|
|
|
|
|
.BR ares_gethostbyname (3),
|
|
|
|
|
.BR ares_free_hostent (3),
|
|
|
|
|
.BR ares_init_options (3)
|
|
|
|
|
.SH AUTHOR
|
|
|
|
|
Brad Spencer
|
|
|
|
|
.br
|
|
|
|
|
Copyright 1998 by the Massachusetts Institute of Technology.
|
